Has anyone ever seen something eat just the inside of a hen?

Went out to collect eggs, found one of our hens dead, and at first it kinda looked like something had sort of eaten half of it. (This is in Southern California, btw. Specifically, riverside county, the Lake Elsinore area.) I went to pick it up and saw that it wasn't half eaten, the skin, bones, feathers, wings, and head were all there and seemed mostly uninjured except for the back end. Backside was completely opened up and the inside was all empty. I've never seen anything like it. Could the other hens have done this? I can't imagine it would've been a coyote, and possums aren't really aggressive like that.